Home | History | Annotate | Download | only in browser 
      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_
      6 #define CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/callback.h"
     10 #include "base/time/time.h"
     11 #include "content/common/content_export.h"
     12 
     13 namespace base {
     14 class MessageLoop;
     15 }
     16 
     17 namespace content {
     18 
     19 // Fetch histogram data asynchronously from the various child processes, into
     20 // the browser process. This method is used by the metrics services in
     21 // preparation for a log upload. It contacts all processes, and get them to
     22 // upload to the browser any/all changes to histograms.  When all changes have
     23 // been acquired, or when the wait time expires (whichever is sooner), post the
     24 // callback to the specified message loop. Note the callback is posted exactly
     25 // once.
     26 CONTENT_EXPORT void FetchHistogramsAsynchronously(
     27     base::MessageLoop* callback_thread,
     28     const base::Closure& callback,
     29     base::TimeDelta wait_time);
     30 
     31 }  // namespace content
     32 
     33 #endif  // CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_
     34